CN103428858B

CN103428858B - The sending method of control signaling, the detection method of control signaling, terminal and base station

Info

Publication number: CN103428858B
Application number: CN201210150040.5A
Authority: CN
Inventors: 陈艺戬; 戴博; 左志松; 张文峰
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2012-05-15
Filing date: 2012-05-15
Publication date: 2018-03-23
Anticipated expiration: 2032-05-15
Also published as: CN103428858A

Abstract

The invention provides a kind of sending method of control signaling, the detection method of control signaling, terminal and base station, wherein, detection method includes：Terminal receives the configuration signal for carrying candidate's control signaling transfer resource positional information that base station is sent；Terminal determines to need the aggregation level N (1) ... N (n) detected according to configuration signal, the DMRS port set used according to the position candidate under aggregation level N (i) in RB determines the DMRS port set that the position candidate under current aggregation level N (j) uses in the RB, or, according to aggregation level N (1) ..., the DMRS port set that the position candidate under N (n) under any aggregation level uses in RB is that the subset for the DMRS port set that the position candidate in the RB under N (p) uses determines DMRS port set that the position candidate under any aggregation level uses.Channel estimation number and implementation complexity can be reduced using the present invention.

Description

Control signaling sending method, control signaling detection method, terminal and base station

Technical Field

The present invention relates to the field of communications, and in particular, to a method for sending a control signaling, a method for detecting a control signaling, a terminal, and a base station.

Background

In a Long Term Evolution (LTE) system and an LTE-advanced (LTE-advanced) system, a downlink physical layer Control signaling includes downlink Grant (DLGrant) information related to downlink transmission that a terminal needs to know and uplink Grant (UL Grant) information related to uplink transmission that a UE needs to know, to indicate various transmission-related information such as a transmission resource position, a modulation and coding scheme, and the physical layer Control signaling is transmitted on a Physical Downlink Control Channel (PDCCH). The physical layer control signaling here mainly refers to user-specific control signaling of the physical layer.

In Release 8/9 of the LTE system and R10 of the LTE-advanced system, a physical layer control channel for transmitting a physical layer control signaling is generally configured to be transmitted on the first N Orthogonal Frequency Division Multiplexing (OFDM) symbols, and the N symbols are generally referred to as a control signaling transmission region.

Available transmission resources of an existing control signaling transmission region (a first control signaling transmission region, a first control signaling region) are divided into a plurality of Control Channel Element (CCE) resource units, resources occupied by control information are allocated in units of CCEs, the CCE here may be further subdivided into a plurality of REGs, one CCE is composed of a plurality of discontinuous REGs, generally, 9 resource unit groups (REGs) constitute one CCE, and further each REG is composed of a plurality of basic resource units.

The proprietary and public control signaling are transmitted by taking CCE as a resource unit. Then mapped to corresponding REG resources, and further mapped to REs (Resource elements, minimum Resource units) of a plurality of Physical Resource Blocks (PRBs). The terminal typically performs blind detection in the following manner: calculating the starting position of the proprietary control signaling and the public control signaling, here we mainly focus on the proprietary control signaling:

table 1 aggregation level and blind detection times for control signaling blind detection

It can be seen that the control signaling transmission resources allocated by the users are not continuous, which brings many difficulties to the implementation of the closed-loop precoding technique in the multi-antenna system, so that the control signaling region can only use the diversity technique and is difficult to use the closed-loop precoding technique. The main reason is that there is a great design difficulty in the demodulation pilot design and channel state information feedback of the first control signaling region, so the control signaling in the existing release only supports the discontinuous resource transmission and diversity technology.

In the version after R10, in order to improve the transmission capacity of the control channel and support the control signaling of more users, design considerations are made to create a new control channel region (a second control signaling transmission region, a second control signaling region), and the control signaling transmission resource of the same UE may be a continuous time-frequency resource to support a closed-loop precoding technique, so as to improve the transmission performance of the control information.

The control signaling areas of the new and old versions are shown in fig. 1, and this method allocates part of transmission resources to be used in the new control signaling transmission area in the original R8/9/10 Physical Downlink Shared Channel (PDSCH) transmission area, so that the closed-loop precoding technology can be supported during control signaling transmission, and the control signaling capacity can be increased to support the control signaling of more users. We may refer to the control channel transmitted in the second control signaling region as a second control channel or enhanced PDCCH (ePDCCH).

Next, some ePDCCH detection methods are introduced in terms of detection resource granularity, ePDCCH candidate (ePDCCH candidates) pilot ports for ePDCCH transmission, transmission mode, and the like.

Generally, because no additional information informs the terminal of how much transmission resources will be occupied by the control information after coded modulation, the base station and the terminal may agree a basic resource allocation unit as the minimum allocation granularity, and then further agree several sizes of occupied resources, which are generally aggregation of one or more resource allocation units, the aggregation of N resource allocation units is called aggregation level N, the base station may send the coded modulated control information with one of the sizes, and the terminal may blindly detect several sizes of the agreed resources, which may also be called agreed several aggregation levels. Generally, a basic resource unit eCCE is defined, the eCCE has a function similar to that of the previous CCE, and the eCCE may borrow the definition of the old CCE or slightly modify the old CCE in the second control region, or may perform a new definition, and may be a fixed size (size) or a variable size (size).

Then, the control signaling may define different aggregation levels, such as aggregation 1, 2, 4, 8, or1, 2, 4 or1, 3, 5, 7, etc., based on the eCCE. Different aggregation levels represent different resource sizes. The terminal can also detect these aggregation levels blindly with relative specificity.

The UE detects for these candidates. To perform blind-by-blind detection on candidates, it is first determined what pilot port is used by each eCCE resource included in candidates for demodulation. In the second control signaling transmission region, the dedicated demodulation pilot (DMRS) in R10 can be reused to demodulate the control signaling, and the precoding technology is well supported. The DMRS is also called UE-Specific demodulation pilot (UE Specific RS), and is mainly used for demodulation of control signaling or data, specifically, here, demodulation of downlink control signaling information. In the old version, the demodulation design mainly aims at data information, and 8 corresponding DMRS ports (ports) are provided, the maximum support is 8 layers, and the ports are respectively ports 7-14. The second control signaling region typically uses only 4 ports for demodulation of control signaling, Port 7-10.

The available resources included in the second control signaling region in one physical resource block RB may be divided into a plurality of resource sets, and the specific division method includes multiple manners, such as a frequency division manner, a time division manner, a code division manner, and some hybrid manners. The corresponding relationship between Resource sets (Resource sets) and pilot ports needs to be defined, so that the used pilot ports can be determined according to which Resource set or sets the resources occupied by the ecces belong to during detection.

When the UE performs blind detection on the ePDCCH, the relationship between resource sets and used pilot ports is determined according to the resource size occupied by the ePDCCH candidates in the RB, for example:

when 1resource set is occupied, the relationship between resource set and used pilot port is shown in table 2:

TABLE 2 relationship of resource sets to used pilot ports

Resource set 1	Port a
		Resource set 2	Port b
Resource set 3	Port c
		Resource set 4	Port d

When 2resource sets are occupied, the relationship between resource sets and used pilot ports is shown in table 3 or table 4:

TABLE 3 relationship of resource sets to used pilot ports

Resource set 1	Port a
		Resource set 2	Port a
Resource set 3	Port d
		Resource set 4	Port d

TABLE 4 relationship of resource sets to used pilot ports

Resource set 1	Port b
		Resource set 2	Port b
Resource set 3	Port c
		Resource set 4	Port c

When 4resource sets are occupied, the relationship between resource sets and the used pilot ports is shown in table 5:

TABLE 5 relationship of resource sets to used pilot ports

The problems existing in the prior art are as follows: taking the following ePDCCH candidates as an example, each grid represents a resource set, if the configured Aggregation Level (AL) to be detected includes Aggregation 1, 2, 4, 8, where AL 1, 2, 4 is transmission of Localized mapping (Localized), and AL ═ 8 is transmission of Distributed (Distributed). The ePDCCH candidates in each aggregation level include candidates shown in fig. 2, and when the UE detects ePDCCH candidates, the number of channel estimation times is large because the UEs need to estimate all of port a to port d in each RB, which may cause high implementation complexity for the terminal.

Disclosure of Invention

The embodiment of the invention provides a sending method of a control signaling, a detection method of the control signaling, a terminal and a base station, and aims to solve the problem of higher complexity of the terminal caused by excessive channel estimation times in the existing control channel detection technology.

The embodiment of the invention provides a method for sending a control signaling, which comprises the following steps:

a base station configures control signaling candidate transmission resource position information for a terminal, wherein the control signaling candidate transmission resource position information comprises a plurality of aggregation levels N (1) ·.... N (N) and candidate positions transmitted by enhanced physical downlink control channels (ePDCCH) under each aggregation level, and N is an integer greater than 1;

and the base station selects a time-frequency resource position corresponding to one candidate position from the candidate control signaling transmission resource positions to send a configuration signaling carrying the information of the candidate control signaling transmission resource positions to the terminal.

Preferably, the set of dedicated demodulation pilot (DMRS) ports used by a candidate position at any aggregation level at the aggregation level N (1.).. No. N (N) within a Resource Block (RB) is a subset of the set of DMRS ports used by the candidate position at N (i) within the RB, where i is a positive integer less than or equal to N.

Preferably, the aggregation level N (i) is aggregation level 1, aggregation level 2, aggregation level 4 or aggregation level 8.

Preferably, the set of DMRS ports used by the candidate location at any aggregation level within an RB includes two or three DMRS ports.

Preferably, when the set of DMRS ports used by the candidate location at any aggregation level in the RB includes two, the two DMRS ports are port7 and port9, or are port8 and port 10.

The embodiment of the invention also provides a method for detecting the control signaling, which comprises the following steps:

a terminal receives a configuration signaling which is sent by a base station and carries the position information of a candidate transmission resource of a control signaling;

the terminal determines an aggregation level N (1) ·.... N (N) to be detected and candidate positions under each aggregation level according to the configuration signaling;

the terminal determines a dedicated demodulation reference signal (DMRS) port set used by a candidate position under an aggregation level N (i) in a Resource Block (RB) according to the DMRS port set used by the candidate position under the aggregation level N (i) in the RB, wherein i and j are positive integers less than or equal to N and different, and N is an integer greater than 1; or,

the set of DMRS ports used by the candidate position at any aggregation level under the aggregation level N (1) ·.

Preferably, the set of dedicated demodulation pilot (DMRS) ports used by the candidate locations at aggregation level N (i) within a Resource Block (RB) comprises two or three DMRS ports.

Preferably, when the set of DMRS ports used by the candidate locations at the aggregation level N (i) within an RB contains two DMRS ports, the two DMRS ports are port7 and port9, or are port8 and port 10.

Preferably, after the terminal determines the set of DMRS ports used by the candidate position at the current aggregation level N (j) in the RB or determines the set of DMRS ports used by the candidate position at any aggregation level, the method further includes:

and the terminal determines the DMRS port used by the candidate position under the current aggregation level N (j) in the RB according to the high-layer signaling sent by the base station.

Preferably, the method further comprises: and the terminal determines the resource set occupied by the candidate position under the current aggregation level N (m) in the RB according to the resource set occupied by the candidate position under the aggregation level N (k) in the RB, wherein m < k < 4.

An embodiment of the present invention further provides a base station, where the base station includes:

a configuration module, configured to configure control signaling candidate transmission resource location information for a terminal, where the control signaling candidate transmission resource location information includes multiple aggregation levels N (1) ·.... N (N) and candidate locations transmitted by an enhanced physical downlink control channel (ePDCCH) at each aggregation level, and N is an integer greater than 1;

and the sending module is used for selecting a time-frequency resource position corresponding to one candidate position from the candidate control signaling transmission resource positions to send the configuration signaling carrying the information of the candidate control signaling transmission resource positions to the terminal.

An embodiment of the present invention further provides a terminal, where the terminal includes:

a receiving module, configured to receive a configuration signaling carrying position information of a candidate transmission resource of a control signaling sent by a base station;

a determining module, configured to determine, according to the configuration signaling, an aggregation level N (1) ·.. N (N) that needs to be detected, and candidate positions at each aggregation level; determining a dedicated demodulation pilot frequency (DMRS) port set used by a candidate position under an aggregation level N (i) in a Resource Block (RB) according to the DMRS port set used by the candidate position under the aggregation level N (i) in the RB, wherein i and j are positive integers less than or equal to N and different, and N is an integer greater than 1; or, a set of DMRS ports used by a candidate position at any aggregation level at the aggregation level N (1.) other.

Preferably, the determining module is further configured to: and determining the DMRS port used by the candidate position under the current aggregation level N (j) in the RB according to the higher layer signaling sent by the base station.

Preferably, the determining module is further configured to: and determining the resource set occupied by the candidate position under the current aggregation level N (m) in the RB according to the resource set occupied by the candidate position under the aggregation level N (k) in the RB, wherein m < k < 4.

According to the embodiment of the invention, the number of the ports appearing in each RB is reduced by reusing the ports, so that the channel estimation times are reduced, the implementation complexity is reduced, and the detection delay is further reduced.

Drawings

FIG. 1 is a diagram illustrating control signaling areas of an existing new or old version;

fig. 2 is a diagram illustrating existing candidates for ePDCCH candidates at each aggregation level;

FIG. 3 is a diagram of a first embodiment of the present invention for determining ports to use at each aggregation level;

FIG. 4 is a diagram of a second embodiment of the present invention for determining ports to use at each aggregation level;

FIG. 5 is a diagram of a third embodiment of the present invention for determining ports to use at each aggregation level;

FIG. 6 is a diagram of a fourth embodiment of the present invention for determining ports to use at each aggregation level;

FIG. 7 is a diagram of a fifth embodiment of the present invention for determining ports to use at each aggregation level;

FIG. 8 is a block diagram of a base station according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a terminal according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.

The embodiment of the invention provides a method for sending a control signaling, which is described from a base station side and comprises the following steps:

step 11, a base station configures control signaling candidate transmission resource position information for a terminal, wherein the control signaling candidate transmission resource position information comprises a plurality of aggregation levels N (1) ·.... N (N) and candidate positions transmitted by enhanced physical downlink control channels (ePDCCH) under each aggregation level;

wherein a set of dedicated demodulation pilot (DMRS) ports used by a candidate position at any aggregation level at the aggregation level N (1.).. No. N (N) within a Resource Block (RB) is a subset of a set of DMRS ports used by a candidate position at N (i) within the RB, where i is a positive integer less than or equal to N, and N is an integer greater than 1; the aggregation level N (i) may be aggregation level 1, aggregation level 2, aggregation level 4, or aggregation level 8; the DMRS port set used by the candidate position at any aggregation level in the RB comprises two or three DMRS ports; when the candidate position at any aggregation level contains two DMRS ports used in the RB, the two DMRS ports are port7 and port9, or are port8 and port 10;

and step 12, the base station selects a time-frequency resource position corresponding to one candidate position from the candidate control signaling transmission resource positions to send a configuration signaling carrying the information of the candidate control signaling transmission resource positions to the terminal.

Correspondingly, an embodiment of the present invention further provides a method for detecting a control signaling, where the embodiment is described from a terminal side, and the method includes:

step 21, the terminal receives a configuration signaling which is sent by the base station and carries the position information of the candidate transmission resource of the control signaling;

step 22, the terminal determines an aggregation level N (1) ·. N (N) to be detected and candidate positions under each aggregation level according to the configuration signaling;

step 23, the terminal determines a dedicated demodulation pilot (DMRS) port set used by a candidate position at a current aggregation level N (j) in a Resource Block (RB) according to a DMRS port set used by the candidate position at the aggregation level N (i) in the RB, where i and j are positive integers less than or equal to N and are different from each other, and N is an integer greater than 1; or,

In addition, the method may further include: and the terminal determines the resource set occupied by the candidates in the RB at the current aggregation level N (m) according to the resource set occupied by the candidates in the RB at the aggregation level N (k), wherein m < k < 4.

The technical solution of the present invention is described in detail below from the perspective of terminal and base station interaction:

example one

The base station sends the control signaling on the downlink transmission resource of the second control signaling area, when the base station sends the downlink control signaling, the base station has several sizes capable of selecting the detection of the control signaling to perform the adaptation of the code rate when the control signaling is transmitted, and the sizes are respectively several different aggregation levels defined based on the eCCE:

aggregation level N (1), aggregation level N (2), aggregation level N (3), aggregation level N (4), where N (1) -N (4) are integers. Common values are 1, 2, 4 and 8 respectively. Here, the number is not limited to this value, and is not limited to 4 aggregation levels, and other cases such as 2 aggregation levels and 3 aggregation levels are also possible.

For the base station and the terminal, the following mapping relationship may be agreed to exist:

if candidates of ePDCCH occupy 1 eCCE in RB and the eCCE corresponds to one resource, the DMRS port corresponding to each resource set is determined according to the table of relationship between resource set and DMRS port at this time, which is described with reference to table 5 in the background art, but not limited to the relationship described in the table. Assuming that a, b, c, and d in the table are 7, 9, 8, and 10, respectively, or other values, such as 7, 8, 9, and 10, the former is assumed for explanation, and table 5 may be embodied in the form of table 5-1.

TABLE 5-1 relationship of resource sets to pilot ports used

Resource set1	Port 7
		Resource set 2	Port 9
Resource set 3	Port 8
		Resource set 4	Port 10

If one of the occupied Resource sets is Resource1 therein, its fixed or configured used demodulation pilot Port is Port7, if it is Resource2 therein, its fixed or configured used demodulation pilot Port is Port9, if it is Resource3 therein, its fixed or configured used demodulation pilot Port is Port8, if it is Resource4 therein, its fixed or configured used demodulation pilot Port is Port 10; if the situation is the configuration situation, the base station is configured through the configuration signaling.

If 2 ecces are occupied in an RB, two ecces correspond to 2 resources, and a specific DMRS port is determined according to a relation table 3 or table 4 between resource set and DMRS port when 2resource set is occupied in the background art, where a, b, c, and d are 7, 9, 8, and 10, respectively, table 3 may be embodied as table 3-1, and table 4 may be embodied as table 4-1.

TABLE 3-1 relationship of resource sets to pilot ports used

Resource set1	Port 7
		Resource set 2	Port 7
Resource set 3	Port 10
		Resource set 4	Port 10

TABLE 4-1 relationship of resource sets to pilot ports used

Resource set1	Port 9
		Resource set 2	Port 9
Resource set 3	Port 8
		Resource set 4	Port 8

If the two resources are Resource1 and Resource2, the two resources are fixed or configured to use a pilot port7 for channel estimation and demodulation; if Resource3 and 4, both resources are fixed or configured to use the pilot port10 for channel estimation and demodulation; or, if the two resources are Resource1 and Resource2, the two resources are fixed or configured to use the pilot port9 for channel estimation and demodulation; in the case of resources 3 and 4, both resources are fixed or configured for channel estimation and demodulation using pilot port 8.

If candidates of ePDCCH occupy 4 eCCEs in RB, the 4 eCCEs correspond to 4 resources, and DMRS ports corresponding to resource sets when 4resource sets are occupied can be determined according to DMRS ports sets used by candidates under other aggregation levels; or determined according to the set of DMRS ports used by candidates at other aggregation levels in combination with higher layer configuration signaling.

The complexity of channel estimation can be minimized by the configuration shown in fig. 3, where 2 candidates exist in each RB for candidates of ePDCCH at aggregation level 1, and include resources 0 and 1, respectively, and dmrport a and b are used, corresponding to 7 and 9, respectively.

The ePDCCH candidates under the aggregation level 2 have one candidate in each RB, the candidate contains aggregation of Resource sets 0 and 1 in the RB, two Resource sets correspond to one DMRS port, as DMRS port sets corresponding to the Resource sets occupied by the ePDCCH candidates under the aggregation level 1 are ports 7 and 9, and the used DMRS ports can only be ports 7or ports 9 due to the need to satisfy the existence of the subset relationship; the specific usage of port7or port9 can be determined according to higher layer signaling issued by the base station.

The ePDCCH candidates under aggregation level 4 have 1 candidate in each RB, where the candidate includes all 4Resource sets in the RB, and 4Resource sets correspond to one dmrport, and here, because DMRS port sets corresponding to the Resource sets occupied by the ePDCCH candidates under aggregation level 1 are ports 7 and 9, the DMRS port sets may be one of port7 and port9, and specifically, which port is determined by 1-bit signaling of the base station. This approach is equivalent to common determination from the base station's 1bit signaling and DMRS port used by aggregation level 1. It can also be fixed that 4Resource sets correspond to one DMRS port and definitely belong to the port7 and 8 sets, so that the intersection can be determined as the port 7.

There are two cases in aggregation level 8:

one case is that the method for determining the pilot port is the same for the case of 4 or 0 Resource sets within an RB as for the case of 4Resource sets at aggregation level 4;

in another case, when there is one candidate within an RB, the aggregation including 2resource sets is a resource set0, 1 aggregation, and the pilot port determination method is the same as that in the case of the aggregation level 2.

In this embodiment, the DMRS ports used by ePDCCH candidates at each aggregation level are all subsets used by ePDCCH candidates at aggregation level 1.

Example two

In the first embodiment, the complexity of channel estimation can also be minimized by the configuration shown in fig. 4:

the candidates of the ePDCCH at aggregation level 1 have 2 candidates in each RB, and each candidate includes Resource set2 and 3, and the DMRS ports used are a and b, which correspond to 8 and 10, respectively.

The ePDCCH candidates under the aggregation level 2 have one candidate in each RB, the candidate contains aggregation of Resource sets 2 and 3 in the RB, two Resource sets correspond to one DMRS port, as DMRS port sets corresponding to the Resource sets occupied by the ePDCCH candidates under the aggregation level 1 are ports 8 and 10, and as the need to satisfy the existence of the subset relationship, the used DMRS ports can only be the port8or port 10; the specific usage of port8or port10 can be determined according to higher layer signaling issued by the base station.

The ePDCCH candidates under aggregation level 4 have 1 candidate in each RB, where the candidate includes all 4Resource sets in the RB, and 4Resource sets correspond to one dmrport, and here, because DMRS port sets corresponding to the Resource sets occupied by the ePDCCH candidates under aggregation level 1 are ports 8 and 10, the DMRS port set may be one of ports 8 and 10, and specifically, which port is determined by the 1-bit signaling of the base station. This approach is equivalent to common determination from the base station's 1bit signaling and DMRS port used by aggregation level 1. It can also be fixed that 4Resource sets correspond to one DMRS port and definitely belong to the port7 and 8 sets, so that the intersection can be determined as the port 8.

There are two cases in aggregation level 8:

one case is that the method of determining the pilot port is the same for the case of 4 or 0 Resource sets within an RB as for the case of 4Resource sets at aggregation level 4.

In another case, when there is one candidate within an RB, including aggregation of 2resource sets, which is aggregation of resource sets 2, 3, the pilot port determination method is the same as that in the case of aggregation level 2.

EXAMPLE III

In the first embodiment, the complexity of channel estimation can also be minimized by the configuration shown in fig. 5:

the candidates of ePDCCH in aggregation level 1 have 1 candidate in each RB, including Resource set0, and the DMRS port used is a, corresponding to port 7.

The ePDCCH candidates under aggregation level 2 have one candidate in each RB, where the candidate includes aggregation of Resource sets 0 and 1 in the RB, and two Resource sets correspond to one DMRS port, because the DMRS port set corresponding to the Resource set occupied by the ePDCCH candidates at aggregation level 1 is port7, and because the presence of the subset relationship needs to be satisfied, the DMRS port used is port 7.

The ePDCCH candidates under aggregation level 4 have 1 candidate in each RB, where the candidate includes all 4Resource sets in the RB, and 4Resource sets correspond to one dmrport, and here, since the DMRS port set corresponding to the Resource set occupied by the ePDCCH candidates under aggregation level 1 is port7, it is determined that one DMRS port corresponding to the 4Resource sets is also port 7.

There are two cases in aggregation level 8:

In this embodiment, DMRS ports used by ePDCCH candidates at each aggregation level are the same, and are port 7.

Example four

In the first embodiment, the complexity of channel estimation can also be minimized by the configuration shown in fig. 6:

the candidates of the ePDCCH under aggregation level 1 have 1 candidates in each RB, and include Resource set1, and the DMRS port used is b and corresponds to port 9.

The ePDCCH candidates under aggregation level 2 have one candidate in each RB, where the candidate includes aggregation of Resource sets 0 and 1 in the RB, and two Resource sets correspond to one DMRS port, because the DMRS port set corresponding to the Resource sets occupied by the ePDCCH candidates at aggregation level 1 is port9, and because the subset relationship needs to be satisfied, the DMRS port used is port 9.

The ePDCCH candidates under aggregation level 4 have 1 candidate in each RB, where the candidate includes all 4Resource sets in the RB, and the 4Resource sets correspond to one dmrport, and here, since the DMRS port set corresponding to the Resource set occupied by the ePDCCH candidates under aggregation level 1 is port9, it is determined that one DMRS port corresponding to the 4Resource sets is also port 9.

There are two cases in aggregation level 8:

In another case, a candidate exists in the RB, which includes an aggregation of 2resource sets, and is an aggregation of resource set0, 1, the pilot port determination method is the same as that in the case of the aggregation level 2.

In this embodiment, DMRS ports used by ePDCCH candidates at each aggregation level are the same, and are port 9.

EXAMPLE five

In the first embodiment, the complexity of channel estimation can be minimized by the configuration shown in fig. 6:

the candidates of the ePDCCH under aggregation level 1 have 1 candidates in each RB, and include Resource set2, and the DMRS port used is c and corresponds to port 8.

The ePDCCH candidates under the aggregation level 2 have one candidate in each RB, the candidate contains aggregation of Resource sets 2 and 3 in the RB, two Resource sets correspond to one DMRS port, as DMRS port sets corresponding to the Resource sets occupied by the ePDCCH candidates under the aggregation level 4 are ports 8 and 10, and as the subset relationship needs to be satisfied, the used DMRS port is port8or10, and can be determined through high-level signaling configuration.

The ePDCCH candidates under aggregation level 4 have 2 candidates in each RB, where the 2 candidates each include a Resource set, which is Resource set2 and 3, and the two resources each correspond to a DMRS port, which is port8 and port10, respectively.

There are two cases in aggregation level 8:

in one case, when 4 or 0 Resource sets are occupied in an RB and 4Resource sets are occupied in an aggregation level 4, according to the set of DMRS ports used by candidates in the aggregation level 4, the DMRS port used by the aggregation level 4 may be determined to be one of ports 8 and 10, and may be configured.

In another case, a candidate exists in the RB, which includes an aggregation of 2resource sets, and is an aggregation of resource sets 2 and 3, the pilot port determination method is the same as that in the case of the aggregation level 2.

In this embodiment, the DMRS ports sets used by ePDCCH candidates at each aggregation level are all a subset of the DMRS ports sets used at aggregation level 4.

As shown in fig. 8, which is a schematic structural diagram of a base station of the present invention, the base station includes a configuration module 81 and a sending module 82, where:

The set of dedicated demodulation pilot (DMRS) ports used by a candidate position at any aggregation level at the aggregation level N (1) ·.

Wherein the aggregation level N (i) is aggregation level 1, aggregation level 2, aggregation level 4, or aggregation level 8.

In addition, the set of DMRS ports used by the candidate position at any aggregation level in the RB comprises two or three DMRS ports; when the set of DMRS ports used by the candidate position at any aggregation level in the RB contains two, the two DMRS ports are port7 and port9, or are port8 and port 10.

The base station transmits the configuration signaling to the terminal, so that the terminal can reuse the ports, the number of the ports in each RB is reduced, and the channel estimation times are reduced.

As shown in fig. 9, which is a schematic structural diagram of an embodiment of the terminal of the present invention, the terminal includes a receiving module 91 and a determining module 92, wherein:

Wherein the set of dedicated demodulation pilot (DMRS) ports used within a Resource Block (RB) by the candidate locations at aggregation level N (i) includes two or three DMRS ports; when the set of DMRS ports used by the candidate location at aggregation level N (i) within an RB contains two DMRS ports, the two DMRS ports are port7 and port9, or are port8 and port 10. The aggregation level N (i) is aggregation level 1, aggregation level 2, aggregation level 4, or aggregation level 8, and so on.

Additionally, the determining module is further configured to: and determining the DMRS port used by the candidates under the current aggregation level N (j) in the RB according to the high-layer signaling sent by the base station.

Further, the determining module is further configured to: determining the resource set occupied by candidates in the RB at the current aggregation level N (m) according to the resource set occupied by candidates in the RB at the aggregation level N (k), wherein m < k < 4.

The terminal reduces the number of ports in each RB by reusing the ports, thereby reducing the channel estimation times, reducing the implementation complexity and further reducing the detection delay.

It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing the relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the above embodiments may be implemented using one or more integrated circuits. Accordingly, each module/unit in the above embodiments may be implemented in the form of hardware, and may also be implemented in the form of a software functional module. The present invention is not limited to any specific form of combination of hardware and software.

The above embodiments are merely to illustrate the technical solutions of the present invention and not to limit the present invention, and the present invention has been described in detail with reference to the preferred embodiments. It will be understood by those skilled in the art that various modifications and equivalent arrangements may be made without departing from the spirit and scope of the present invention and it should be understood that the present invention is to be covered by the appended claims.

Claims

1. A method for transmitting control signaling, the method comprising:

a base station configures control signaling candidate transmission resource position information for a terminal, wherein the control signaling candidate transmission resource position information comprises a plurality of aggregation levels N (1) … … N (N) and candidate positions for transmission of an enhanced physical downlink control channel ePDCCH (enhanced physical downlink control channel) under each aggregation level, and N is an integer greater than 1;

and the base station selects a time-frequency resource position corresponding to one candidate position from the control signaling candidate transmission resource positions to send a configuration signaling carrying the control signaling candidate transmission resource position information to the terminal.

2. The method of claim 1, wherein:

and the set of the DMRS ports of the exclusive demodulation pilot used by the candidate position under any aggregation level under the aggregation level N (1) … … N (N) in the resource block RB is a subset of the set of the DMRS ports used by the candidate position under N (i) in the RB, wherein i is a positive integer less than or equal to N.

3. The method of claim 2, wherein:

the aggregation level N (i) is aggregation level 1, aggregation level 2, aggregation level 4, or aggregation level 8.

4. The method of claim 2, wherein:

the DMRS port set used by the candidate position at any aggregation level in the RB comprises two or three DMRS ports.

5. The method of claim 4, wherein:

when the set of DMRS ports used by the candidate position at any aggregation level in the RB contains two, the two DMRS ports are port7 and port9, or are port8 and port 10.

6. A method for detecting control signaling, the method comprising:

the terminal determines an aggregation level N (1) … … N (N) to be detected and candidate positions under each aggregation level according to the configuration signaling;

the terminal determines a DMRS port set used by a candidate position under the current aggregation level N (j) in a resource block RB according to a special demodulation pilot frequency DMRS port set used by the candidate position under the aggregation level N (i) in the RB, wherein i and j are positive integers less than or equal to N and different, and N is an integer greater than 1; or,

and the DMRS port set used by the candidate position at any aggregation level under the aggregation level N (1) … … N (N) in the RB is a subset of the DMRS port set used by the candidate position under N (i) in the RB, wherein i is a positive integer less than or equal to N.

7. The method of claim 6, wherein:

the set of DMRS ports used by the candidate locations at aggregation level N (i) within an RB comprises two or three DMRS ports.

8. The method of claim 6, wherein:

9. The method of claim 7, wherein:

when the set of DMRS ports used by the candidate location at aggregation level N (i) within an RB contains two DMRS ports, the two DMRS ports are port7 and port9, or are port8 and port 10.

10. The method of claim 6, wherein:

after the terminal determines the DMRS port set used by the candidate position at the current aggregation level N (j) in the RB or determines the DMRS port set used by the candidate position at any aggregation level, the method further comprises the following steps:

11. The method according to any of claims 6-10, further comprising:

and the terminal determines the resource set occupied by the candidate position under the current aggregation level N (m) in the RB according to the resource set occupied by the candidate position under the aggregation level N (k) in the RB, wherein m < k < 4.

12. A base station, comprising:

a configuration module, configured to configure control signaling candidate transmission resource location information for a terminal, where the control signaling candidate transmission resource location information includes multiple aggregation levels N (1) … … N (N) and candidate locations for transmission of an enhanced physical downlink control channel ePDCCH at each aggregation level, and N is an integer greater than 1;

and the sending module is used for selecting a time-frequency resource position corresponding to one candidate position from the control signaling candidate transmission resource positions to send the configuration signaling carrying the control signaling candidate transmission resource position information to the terminal.

13. The base station of claim 12, wherein:

14. The base station of claim 13, wherein:

15. The base station of claim 13, wherein:

16. The base station of claim 15, wherein:

17. A terminal, characterized in that the terminal comprises:

a determining module, configured to determine, according to the configuration signaling, an aggregation level N (1) … … N (N) that needs to be detected, and candidate locations under each aggregation level; determining a DMRS port set used by a candidate position under the current aggregation level N (j) in a resource block RB according to a special demodulation pilot frequency DMRS port set used by the candidate position under the aggregation level N (i) in the RB, wherein i and j are positive integers less than or equal to N and different, and N is an integer greater than 1; or, the DMRS port set used by a candidate position at any aggregation level at the aggregation level N (1) … … N (N) in an RB is a subset of the DMRS port set used by a candidate position at N (i) in the RB, where i is a positive integer less than or equal to N.

18. The terminal of claim 17, wherein:

19. The terminal of claim 17, wherein:

20. The terminal of claim 18, wherein:

21. The terminal of claim 17, wherein:

the determining module is further configured to: and determining the DMRS port used by the candidate position under the current aggregation level N (j) in the RB according to the higher layer signaling sent by the base station.

22. A terminal according to any of claims 17-21, characterized in that:

the determining module is further configured to: and determining the resource set occupied by the candidate position under the current aggregation level N (m) in the RB according to the resource set occupied by the candidate position under the aggregation level N (k) in the RB, wherein m < k < 4.